_ Part IV. Sect. i. § 2.] EOCENE. 847 
deperditus, C. Lamarckii, Pleurotoma dentata, P. textiliosa, Murex asper, 
Fusus longevus, Turritella imbricata, Ostrea dorsata, O. flabellula, O. longi- 
rostris, Pecten corneus, P. squamula, Lima expansa, Spondylus rarispina, 
Avicula media, Pinna margaritacea, Modiola Deshayesii, Arca biangula 
(Branderi), A. interrupta, A. planicosta, Limopsis granulata, Nucula minor, 
Leda galeottiana, Cardita acuticostata, C. elegans, C. imbricata, ©. planicosta, 
Crassatella grignonensis, Chama calcarata, C. gigas, Nummulites levigata, 
N. scabra, Alveolina fusiformis.. ‘The Bracklesham beds reappear to a 
small extent in the London basin, where they form part of the Middle 
Bagshot beds. 
- The fossils of the Middle Eocene division occur chiefly in the clays. 
An abundant terrestrial flora has been obtained from the plant beds of 
Alum Bay and Bournemouth, the Proteacee being there still numerous, 
together with species of fig, cinnamon, fan-palm (Sabal), oak, yew, 
cypress, laurel, lime, senna, and many more.” Crocodiles still haunted 
the waters, for their bones are mingled with those of sea-snakes and 
turtles, and with tapiroid and other older Tertiary types of terrestrial 
creatures. The occurrence of the foraminiferal genus Nummulites is 
noteworthy. Though comparatively infrequent in England, it plays, 
as already stated, an important part in the Hocene deposits of Central 
and Kastern Europe. 
Upper.—lhe highest division of the Eocene strata of England, ac- 
cording to the classification here followed, includes the uppermost part 
of the Hampshire series, which has long been known as the “ Barton 
Clay,” with, perhaps, the Upper Bagshot sand of the London basin. The 
Barton clay does not occur in that basin, but forms an important feature 
in that of Hampshire, where, on the cliffs of Hordwell, Barton, and in 
the Isle of Wight, it attains a thickness of 300 feet. It consists of grey, 
greenish, and brown clays, with bands of sand, and has long been well 
known for the abundance and excellent preservation of its fossils, chiefly 
- molluscs, of which more than 200 species have been collected, but includ- 
ing also fishes (Lamna, Myliobates) and a crocodile. The following list 
includes some of the more important species for purposes of comparison 
with equivalent foreign deposits: Voluta luctatrix, V. ambigua, V. athleta, 
Conus scabriculus, C. dormitor, Pleurotoma rostrata (and numerous other 
species), Fusus longeevus, F. pyrus, Ostrea gigantea, Vulsella deperdita, Pecten 
reconditus, Lima compta, L. soror, Avicula media, Modiola seminuda, M. sulcata, 
M. ienuistriata, Arca appendiculata, Pectunculus deletus, Cardita Davidsoni, 
C. sulcata, Crassatella sulcata, Chama squamosa, Nummulites planulata, 
N. variolaria. 
Northern France and Belgium.—tThe anticline of the Weald 
which separates the basins of London and Hampshire is prolonged into 
the Continent, where it divides the ‘Tertiary areas of Belgium from those 
of Northern France. There is so much general similarity among the 
older Tertiary deposits of the whole area traversed by this fold as to 
indicate a probable original relation as parts of one great tract of 
sedimentation. Local differences, such as the replacement of fresh-water 
2 See Dixon’s Geology of Sussex ; Edwards and 8. Wood, “ Monograph of Eocene 
Mollusca,” Palzontograph. Soe. 
2 See H. W. Bristow, “ Geology of Isle of Wight ” in Mem. Geol. Surv.; J. S. Gardner, 
Geol. Mag. 1877, p. 129; Nature, vol. xxi, (1879), 181, and the Monograph on Eocene 
fiora already cited. 
